/*
 * Copyright (C) 2005 Luca Veltri - University of Parma - Italy
 *
 * This file is part of MjSip (http://www.mjsip.org)
 *
 * MjSip is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * MjSip is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with MjSip; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author(s):
 * Luca Veltri (luca.veltri@unipr.it)
 */

package org.zoolu.sdp;


import org.zoolu.tools.Parser;


/** SDP connection field.
 * <p>
 * <BLOCKQUOTE><PRE>
 *    connection-field = "c=" nettype SP addrtype SP connection-address CRLF
 *                       ;a connection field must be present
 *                       ;in every media description or at the
 *                       ;session-level
 * </PRE></BLOCKQUOTE>
 */
public class ConnectionField extends SdpField
{
    /** Creates a new ConnectionField. */
    public ConnectionField(String connection_field)
    {  super('c',connection_field);
    }

    /** Creates a new ConnectionField. */
    public ConnectionField(String address_type, String address, int ttl, int num)
    {  super('c',null);
        value="IN "+address_type+" "+address;
        if (ttl>0) value+="/"+ttl;
        if (num>0) value+="/"+num;
    }

    /** Creates a new ConnectionField. */
    public ConnectionField(String address_type, String address)
    {  super('c',"IN "+address_type+" "+address);
    }

    /** Creates a new ConnectionField. */
    public ConnectionField(SdpField sf)
    {  super(sf);
    }

    /** Gets the connection address. */
    public String getAddressType()
    {  String type=(new Parser(value)).skipString().getString();
        return type;
    }

    /** Gets the connection address. */
    public String getAddress()
    {  String address=(new Parser(value)).skipString().skipString().getString();
        int i=address.indexOf("/");
        if (i<0) return address; else return address.substring(0,i);
    }

    /** Gets the TTL. */
    public int getTTL()
    {  String address=(new Parser(value)).skipString().skipString().getString();
        int i=address.indexOf("/");
        if (i<0) return 0;
        int j=address.indexOf("/",i);
        if (j<0) return Integer.parseInt(address.substring(i)); else return Integer.parseInt(address.substring(i,j));
    }

    /** Gets the number of addresses. */
    public int getNum()
    {  String address=(new Parser(value)).skipString().skipString().getString();
        int i=address.indexOf("/");
        if (i<0) return 0;
        int j=address.indexOf("/",i);
        if (j<0) return 0;
        return Integer.parseInt(address.substring(j));
    }

}
